Is there anyway for you to get a job at the university? Depending upon what program you are in sometimes they will hire students. The university libraries are always hiring students, etc. I know these may not pay as much as what you have now, but the environment might be a little better.

Once exams are finished you might what to start looking around campus.

BTw, it isn't worth your health to be working for someone like that (been there done that and it took me years to physicially recover)...